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Unaudited Quarterly Financial Data (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |
Restructuring and reorganization charges | $ 1,000 | $ 800 | $ 2,500 | $ 1,000 | $ 1,600 | $ 1,300 | $ 1,800 |  | $ 5,328 | $ 4,834 | $ 8,661
Impact of restructuring and reorganization charges on EPS | $ 0.02 | $ 0.02 | $ 0.06 | $ 0.02 | $ 0.04 | $ 0.03 | $ 0.04 |  |  |  |
Transaction related cost | $ 11,200 | $ 1,800 |  |  |  |  |  |  | 11,200 |  |
Impact of transaction related cost on EPS | $ 0.23 | $ 0.03 |  |  |  |  |  |  |  |  |
Write-off deferred contract costs of project implementation |  |  | $ 10,000 |  |  |  |  |  |  |  |
Effective income tax rate | 33.00% | 40.00% | 27.00% | 25.00% | 7.00% | 25.00% | 28.00% | 26.00% |  |  |
Income tax benefit | $ (6,423) | $ (9,176) | $ (3,884) | $ (7,162) | $ (1,633) | $ (7,262) | $ (7,458) | $ (6,600) | $ (26,645) | $ (22,953) | $ (20,857)
Comcast |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |
Income tax benefit |  |  |  |  | $ 4,000 |  |  |  |  |  |
Stock warrants exercised |  |  |  |  | 400,000 |  |  |  |  | 400,000 |

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